Deprecate getlocalstreams/getremotestreams, events (#5572)
Deprecate getlocalstreams/getremotestreams, events (#5572)

This change updates 'deprecated' and 'standard_track' flags in BCD to
align with the changes made to the spec in
https://github.com/w3c/webrtc-pc/commit/ce5794c, which revised the
RTCPeerConnection interface to:

* drop the getLocalStreams() method [replaced with getSenders()]
* drop the getRemoteStreams() method [replaced with getReceivers()]
* drop the removeStream() method [replaced by removeTrack()]
* drop the getStreamById() method
* drop the addstream event [replaced with the track event]
* drop the removestream event [replaced with the ended event]
* drop the onaddstream and onremovestream event handlers
mdn/browser-compat-data,chrisdavidmills/browser-compat-data,mdn/browser-compat-data,chrisdavidmills/browser-compat-data